Effect of coexisting inorganic chlorides on lead volatilization from CaO-SiO2-Al2O3 molten slag under municipal solid waste gasification and melting conditions

From the equilibrium calculations on the main elements involved in municipal solid waste in shaft-type gasification/melting furnace, almost 100% of lead compounds were predicted to volatilize as Pb, PbS and PbCl2. The ratio of PbCl2 increased with the increase in chlorine (Cl) content in the waste. It was considered by equilibrium calculations that increased volatilization of lead compounds was attributed to the pronounced formation of PbCl2 by the reaction of PbO with HCl which was released from NaCl, KCl and CaCl2.